Screw-cutting lathe.



A, No. 844,831. PATENTEDTEB. 19, 1907;

1 J. o. SMITH.

SCREW CUTTING LATHB.

APPLICATION FILED MAY 12, 1905.

4 SHEETS-SHEET 1.

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I '--LWE'ILLQQ No. 844,831. I PATBNTBD PEB. 19, A1907.

" J. o. SMITH.

SCREW CUTTING, LATHE.

APPLICATION FILED MAY 12, 1905.

E 4:1 V @im f fmes @Asma/7,

. No. 844,831. PATENTED FEB. 19, 1907. l J. C. SMITH.

SCREW CUTTING LATHE.

APPLICATION .FILED MAY 12, 1905.

4 SHEETS-sum: a.

GW 0%; @M7

PATENTBD PEB. 19, 1907.

- s. G. SMIT-H.

SCREW CUTTING LATHB.

APPLICATION FILED MAY 12, 1905.

4 SHEBTB-SHBBT 4.

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.CIV Elli-LEUR Perser oIiIrIos.

JAiiCssj o gsMITII, or cIIIoAGo, ILLINOIS. e'

SCREW-CUTTING", IIATHE.

. Patented Feb. 19, 1907.

Appleman me@ May 1z ;19o5. seal IIa. 260,078.'

To all whom it Witty concern:

i zen of the United States, and e resident of of this specification.

screw-cutting lathes.

the city of C hi'cego, in the ,countyl of Cook and Stete of"lllinois, heveinvented certain new and useful Improvements in Screw-Cut?y ting Lethes endl do hereby-declare that the following is e full, clear, end-"exact rdeseri tion of theseme, reference being hed to t e eccompenyiirT drawings, and toV the letters of reference marched thereon, which form e.' part This invention reletes to improvements in Screw-cutting lathes constructed with -`trains of intermeshing gears removably secured upon their shafts riving to the feed mechenism` of the cerriege, andthe change of lfeed necesssry to eut threeds of different leed have usuelly been elected by removing 'one set ofgeers end replacing others edepted, to drive the feedsheft et the desired rete. Where the changes 4in the rete of feed ere effected in this menner, it requires considereble time to make the 'chsnges fro'm one feed to snother, end in shops Where such chenges ere frequently necessary e lerge emouutof time is thus wasted..

The object of this invention is to afford feed mechanism for screw-cutting lathes of such e nature that thelethe een be quickly adjusted to cut eny oneof many different leeds without the removal or insertion o f gears or other opeietino` perts.

It is elsoen object of this invention te efford e simple, durable, end easily-operated feed mechenism automatically opersting in shifting, thereby ensbling e lathe of the clessl described to be operated by one not previously skilled in the` u'seot` the seme end enebling. e workmen without previous experience to edjust the lathe immediately' for any one of the meny leeds of thi-eed possible. s

The invention consists in the mettere hereinefter described end more fully pointed out end deiiued' in the appended claims.

In the drewingsFigure 1 is e top pleo View of e lethe embodying my invention.- Fig. 2

is e side elevstion of the seme. Fig. 3 is en,

hsveheretofore been teil of. e pert of the `releasing mechanism. Fig. 10 is e top plen view of the dial and -Ashiftinglever- Fig. 11 is, e side elevation of the` seme. Fig'. 1 2 is e.longitudinal section of the feed-shaft and driving-gears. Fig.`1,3 isa longitudinal section ofv the transmittinggears;` Fig. leisen enlarged longitudinal s ectionof the gears" for the gang of screw- 1510i Fig. 14. Fig'. 16 is en'enlerged detail efe' pert of the lower releasing-shaft.. Fig.

g 1`7. is an enlarged detailof the eccentric beez'- ing for the die-shaft.

bed-,of the lathe es ewhole, which may be constructed in the usuel or any desired menner, eind upon side frame members, each of which, asis usual, is provided Ways al', u )on 'which slide the ci'trriege B B', upon Whic is ceri-led 4 the transversely-movable cross-slide stock D, end' et the front end of the lathe is the heed-stockD, constructed es is usuel and in which. is. journeled the arbor d, upon' which thewjork is-supported and rotated end which is driven et varying speeds Afrom the graduated cous hulleys al. upon the erbord et the inner end of; the pulley is the large gear d2, which interrr eshes `which is secured e gear d5, meshing with a. piniond, secured et the front end of seid larbor corresponding gear on e shaft dl, journeled et the end ofthe heed-stock below the arbor, and et the outer endof seid sheftis secured e. `gear d8, which intermeslies with e gear d1", journaled on e stud-shaft d on the end of the lathe-bed. Also intermeshing with the geer ci is e gear c, uiournziled on e. stud-shaft E, rigidly secured .on the lathe end. The geer e .is'rigidly connected with gears e', e2, e, end

pinions of smell size end the gears e2, e3, end

e4 are graduated sizes, larger than the gear e4.

' Rigidly secured beneath the weys on the freine et the front side of the seme me brackets Gr,- G, and G, sind j ourneled in brackets beneath the top of the freine e. fees-shaft F. the end of which projects 'h e- 'i the stud-shaft E, end journals-d on the pri-- shafts Fig. 15 is e section tekeuonline 15.

C, wl'ieieby the tool is' adjusted lto its Work. At the reer end of the lathe is the usuel .teil- Also `carried` with e'pinion d3 on' a, counter-shaft d4, on'

e4 onseid shaft, which, es shown, ere of different s1ze, of which e and e ere gears or i feed mechanism. Fig. 9` is an enlarged de- Beit known that I, JAMES C. SMITH, e citi- Said pinion d intermeshes with e IOC the geen' e? being youd the front end of the lethe parallel w'ili .\.`7 As shown 1n seid drawings, A nidicetes the ,truding endof said shaft are gearsf,f,f

and f4, respectively corresponding Withfand.

intermeshing With the gears e, ef, e2 e?, and

Said gears are each provided Withajslig'htlyj elongated hub jeach providedyvitht a keyseat therein corresponding with tlriesplinefV seat in the. shaft-F, and in each end vof each hub is inserted a collar ofv metal, ff,rfWhicl1 "is 1 not key-seated, thus aordingtixvithinthehub relatively short feather shifted into position-'to engage any one 'ofi' -said gears to` the shaft, but is prevented ,from

engaging two.- o said gears'.'sinn'l-ltaneouslyf,'y

AIOd '11 Pee-fris* integrally .connected with said feather and' owing to said collar f6..

extends the length of the spline-seat .in said shaft and through the bearingl in the bracket G and aEords-means for shiftnrg the feather as desired. .Rotativelysecured upon the feed-shaft F A at v'the rearoi thebracket G. isa beveled gear.`

H, and at the rear end of the feed-shaft adcated by H2, H3, H4, H5, H", and H7, respectively, and each having a diterent lead of thread; flheront end of. each threaded shaft` projects throughthe beveled gear H, and secured oneachis'a short pinion h or hm, ofwhich the pinions h1 are arranged close to the face of the`beveled gear H, 'and the pinion h projects. beyondfthe same close to the-bracket. Gf, thus enabling any of said shafts to beVv driven independently by'means of said pimons. I

A gear fg" s'secured onvthe feed-shaft F,

kwhich intermeshes With-a gearf, jou'rnaled,-

on the bracket G-,`and this intermesheswith thegearf -f1,fsecured on one end of a short shaft .f13,"which Aextendsthroughthe bracket ,Isls

vGr" and i's provided 'oniitsinner end with a long plnionf, positioned to mesh WithA any l* of the pinions h? or al?, secured' alternately on thefront ends of each screw-shaft, when the gangY of shafts is rotated to the proper position. Y

Journaled on gudgeons 765, extending arri;-

ally into lits ends and which are provided with j opposite ofset end portions which' extend through and are journaled in the brackets G and G2, is a shaftK'opposite'andparallewith Y the shafrt' F, and. splined thereon'ja slidabledie K, in the periphery of Which isprovided .semicylindric seats' corresponding'in number with the number of screw-shafts in the gang and provided With internal screw-threat-ls complement therewith. l The 'inner Vside of thallia projects through the apronBt' of the;

carriage' and is adapted to be `swur'ig 'into enga ement with thev l respective screwfshafts angl tojbe moved thereby'longitudinally of thesha propelling. thev carriage.' v.Said shaft -Kis 'p'rovided'at its rear end Witha gear 7g2-rigidly 'secured long .teeth 'Wh'ch internieshwith tli'eccrre- 'spondin'gl teeth on the `gearfh', sojtliatrota- 'tionjoffthezbeveled gear H' and gear'rh to bringa jg'ivenflscreW-shai' t inteoperative relation produces correspondingfrotation of the' shaitlfto' bring the appropriate `female ,memberfot-'thedieinto vengagement there W'1th. i. Means are provided. for rotating .said-v bev-ele'd gear and adjusting any of said? screwfshaft'swith' the dif-:,Icomprisin `a verti- -calshaftiL journaled in abracket "securedat,t the side of the frame. `,At the 4- loiwen end ofsaid shaft is secured a beveled gear'lq, intermeshing with the beveled gear rigidly and at theupper end of the shaft is se# cured a. dial L', provided in its face .with lines thereon and provided-,With

ofapproximately radially arrangedv 'apertures or seats, one line for each et thescrevv-Y shafts and marked lto indicate Vthe various leads ot thread capable oi" construction lby the use of4 saidparticular screw-shaft as a feed-shaft. p AA lever-L2 .ispivoted uponv a standard kZ2 in position to swing across the top of: the" dial, and a spring-detent 'Z3 is pro-'- respective notches .orapertures in the dial,

one of which isy `rovided iu each line of aper tures or seats or 'each of the gears on the feed-shaft F; Alever Laisfulcrumed on the. side ofthe `tramejand at .its lower endfengages a collarlt, rigidly engaged on the-penof the Ivided in said lever adapted to s engage the ICO;

feather)07 and which acts to adjust the? same l longitudinally of the shaft F'. A connectingrod Z5 joins theupper end ofthe lever L ?With 1 o 5 `vthe middle-part of the lever L2, so that adjustment of saidlever Lf" into any of the lnotches or apertures in theA dial for -a given screw@- shaft acts tov shift the feather into positionL to engage' the corresponding driving-gear to the.

speedshaft F. v Thus each notch. or apergiven screw-shaft.

Journaled on theiront face of. the carriage :near the top oft-he same andl journaledfin lugsor brackets b', b2, and t3, secured to the' carriage, is an adjustingeshatt M; provided at one end Witha crank m for rotating the same and'upo'n Which is secured a torsionspring m', one end of Which is engaged upon a bracket t and the other of which is positivelyengaged on a collar m?, adjustably sefedi-transversely, as is usual, by means of a threaded shaf t c, operated, as shown, hyhand- I Wheelsfc, and, as shown, a sleeve czvis 'secured Ion the outer ,unthreaded Lend of said.

screw-l shaft. adjacent the hand-Wheely by 'means otlacollarc3- Said sleeve-is provided" with a downwardly-extending anni. c4., 'jtd .LID

Iturein'theli'lial aords a different. speed-for a secured on the shaft. M by noans of a setl. screw mi, sc that when the tool `s adjusted in cutting relation the crosssbf'le is held by said shaft;d but when the shaft M is partly turned upon its axis the cross-slide and` tools secured thereon are immediately re- .tracted lt'lechanisin is provided adapted to hold the shalt M in position. to bear t. e thrust against the arose-slide 17, comprising, as nged through shown, rod "mi, n u Y,

'allel with the the brackets .72', h2, and di, p-

shaft M. Said rod is beveled at one end to engage over the hand or crank m and at the other end is pivotally engaged witha lever m7, fulcrurned on a bracket b, secured on the end of the carriage i3, and a pushingspring mS engages beneath the end of said le: ver andholds said rod normally in engagement with the lever fm. .As shown, a stop m9 is adjustably secured upon the frame on the bed of the lathe and provided with a setscrew m1", extending therethrough in position to engage the end of said lever m7 as the carriage approaches the limit of its movernent'tbward the head-stock and by forcing the lever m7 inwardly retracts the rod mi,

whereupon the torsion-spring rotates the shaft M, retracting the tool froin'the cut.

As shown, rreans are provided for stopping the feed of the carriage longitudinally silniultaneo'usly with the retraction of the For this purpose a shaft M is cross-slide. -iournaled at the lower ends of the brackets G and G2, and said shafts K and M are each provided at their. ends with inwardly-directed crank-arms 152 and m13, respectively, and are pivotally connected by means of a connecting rod or link k3, as shown in Fig. S. Said shaft M also extends through and is journaled in knuckles b and bl at the lower edge of the apron of the carriage B, and securedbetwecn said knuckles is a lever-arm m, corresponding with a lever-arm m12 on the shaft M, and a rod M2 positively connects said levers at their ends, so that movement of the shaft M produces 4corresponding irovenient in the shaft M and roc is the shaft K,

swinging the die out of engagement with its shaft.

The operation is as follows: When itis desired to use the lathe for screw-cutting purposes, the lead of threads desirable is determined upon and the dial turned to enable the appropriate screw-'shaft to be engaged by its die on the shaft K. As the dial is turned V the gear L at the lower end of the shaft for said dial rotates the gang of screw-shafts, bringing the one selected approximately 4opposite the die-shaft K, and owing to the geared connection at'the ends of the gang andthe shaft K theY die K is also rotated,

appropriate gear in the "eed-shaft.

bringing the appropriate female Linendier into position Ato receive the selected screwshaft when the dial is adjusted. T he lever L? is then adjusted, bringing its detent into engagement in thev notch marked with the number ofthe thread desiredto be used, and the adjustment of said lever acts to hold the die 'and screw-shaft inengagenient and to shift the feather into enga einent withthe' Said gears are so proportioned and arranged one in relation'to the other as to enable when gears are used five leads of thread to be secured by the use of each screw-shaft, though obviously by using a greater number driving-gears on the feed-shaft F ythe number of leads of thread secured by any given shaft can be increased. The adjustiront of the screw-shaft with the corresponding ,female member of the die on the shaft K, owing to the connection between the shaft K and M and the connection between the latter and the shaft fm, acts to roch` said shaft M, moving the cross-slide inwardly until the eccentric on said shaft is in the position indicated in Fig. '7. The hand-wheel c is then .rotated to adjust to the desired depth of cut,

and the mechanism is thus locked in adjustcd position until the cut is completed, as before described. adjusted by means of the set-screw m5, if desirod, to throw the cross-slide inwardly instead of outwardly when the shaft M is reversed. This is of great importance when cutting internal threads, as in a nut or a pipe, and obviously if the eccentric be detached fronifits shaft' and held from movement in the link c5 the cross-slide C can be operated as is usaul .for other lathes.

While I have described but six screwshafts driven from the feed-shaft, it is obvious that a greater' or less number inay be eznployed, if desired, and also that a greater or ess number of driving-gears may be provided upon said shaft and the stud-shaft E o1 that, the trains of gears whereby the gears on said shaft E are actuated can be varied and that my invention may-.be embodied in other mechanical tools than a lathe proper. l. therefore do not purpose limiting this application otherwise than necessitated by the prior art, as obviously many details of construction and operation may be varied without departing from the principles of this invention. l

I claim as my .invention-- l. In a lathe the combination wi th a short shaft of a plurality of driving-gears thereon, a feed-shaft journalcd on the frame parallel with said short shaft, a plurality of rotatable gears on one end thereof each meshing with one of the driving-gears, a rod provided with a feather for holding any one of said gears in rigid engagement with the shaft, a plurality of screw-shafts each having adiwfrint pitch The eccentric mi may be 9 roo arranged concentric With said feed-shaft, a

. 'beveled gear fjournaled on said feed-shaft and engaging the ends of said screw-shafts, a verl iical shaft journaled on the frame, a beveled gear on one end thereof intermeshing with the aforesaid beveled gear, a dial on the opand adapted to drive any one of the same, a

i diesblock provided With a plurality of threadengaging portions having threads of different i pitch-corresponding to the threads on the screw-shaft, means for adjusting the saine simultaneously With the screw-shafts into position for one of the threaded portions to engage with a correspondingly threaded screw-shaft, a carriage movable by said dieblock and` means connecting said dial with said rod whereby to lock the appropriate one of said rotatable gears to the feed-shaft.

2. In a lathe the combination ith-drivinggears of a rotative fee'dshaft, revoluble gears on one end thereof, means for rigidly engaging any one of said gears withthe-shal't, a lever controlling the saine provided with a locking-pin, an aertured dial adapted to be engaged. by sai locking-pin to hold said lever in adjusted position, a gang of screwshafts having threads of diffe-rent pitch carried on and arranged parallel with and around the feed-shaft, a die-shaft parallel with said feed-shaft, a carriage, a rotatable die-block on said die-shaft projecting through the front of the carriage and having dies therein, having threads corresponding res pectively to the threads on the screw-shafts, intermeshing gears carried on the end of the 'feed-shaft and the die-shaft, means connecting "the dial With the gang of screw-shafts and adapted to rotate the same so as to bring any one of the screw-shafts into engagement withJ the respective die of the die-block, a pinionv driven fromthe feed-shaft, non-connected pinion's on said screw-shafts each adapted to mesh With said pinion whereby any one of said screw-shafts may be driven independently of the others.

p 3j .ln a machine of the class described the coi'nbination with a carriage and a rotatablev feed-shaft, of a plurality of different-sized gears for varying the rate of drive o1 the feedshal't, a feather adapted to firmly engage any one of said gears to the feed-shaft, a lever for adjusting said'feather into engagement with anv one'of .said ears, a beveled gear journaled on said feet -shaft, a plurality of screwshafts -j'ou1naled`at'tlieir-ends therein, a gear I on the other end of the feed-shaft affording journals forthe corresponding ends of said kscrew'-shafts, gears on said screw-shafts adapted 'to engage a pinion driven by said feed-shaft whereby anyoiieimay. ,bve-v, driven, a shaft parallel with said feed-shaft, acarriage movable -longitudinallyfitliereof, ,a die- -engaged a said shaft and adapted to ,move

'the die and screw-shafts are simultaneously the carriage, a shaft having a beveled gear meshing With said beveled gear on the feedshaft and connections between said shaft having a bevel-gear and Vsaid lever whereby adjusted to operativeposition.

4. In a machine of the class described the combination With a feed-shaft of a plurality of rotatable gears journaled thereon, a feather adapted to rigidly engage one of said gears with the shaft, a plurality of difieren( ly-s threaded screw-shafts surrounding said feedshaft, apinion on the end of cach screvvshaft, a pinion on said feed-shaft, a pinion connecting the pinions on the feed-shaft and screw-shafts and adapted to drive any one of said screw-shafts, a dial having a plurality oi rovvsof apertures thereon, each roW appropriated to one of said screw-shafts, an adjusting-lever connected with said feather and a pin thereon adapted to engage in said apertures thereby regulating' the speed of said screw-shafts, a shaft, a die slidably engaged thereon said die having a plurality of faces one for cach screw-shaft, a carriage operated by said die and means connected With said dial adapted when the same is actuated to actuate one :of said screw-shafts, to engage its complemental die-face.

5. The combination with a frame, carriage, head-stock and arbor, of a stud-shaft on the end of the frame, a plurality of rigidlyconnected gears rotatable thereon and of dill'erent sizes, intermeshing gears connecting said arbor and one of tle gears on said stud-shaft, a feed-shaft, a plurality o f gears on one end tlrereof, each coinpleniental vwith the corresponding gear on the stud-sli aft and independently revoluble, a relatively short feather on the feed-shaft adapted to engage any one of said gears in driving engagement thereto, a rodintegral with said featlier and extending longitudinally of said feed-shaft, a lever engaged to said rod and pivoted to tlfe frame, a dial having rows of alincd apertures therein, a lever engaged with the aforesaid lever and adapted to engage in said apertures to regulate the speed -of the feed-shaft, a

plurality of screw-shafts concentrically arv, ranged with said feed-shaft, a die havingl faces corresponding to said screw-shafts andl carried Ion al shaft parallel with said feedshaft, means engaged to said dial for rcvolv- LIO .ing said screw-shafts, 1 means foradjusting one of said die-faces in operative position with its complemental screw-sl aft and means connecting said feed-shaft and .screw-shafts i, Wherebylthe s ,.reW-shaftsl are driven at feed-. shaft rate. y' 1- l 6, The combination with alath'e-bed, carriage, head-stock and arbor of a revolnble feed-shaft journaled at'tle side ofmtlie bed, a v studs-sf."aft'A on the' end ofthe bed', a,plurali tyx.

of rrdljy-connected gears rotatable itleron "and f (interviewees, driving wmecrionsbe-- esegesi tween the .arbor and one of said gears, a plu-- ra'lity of gears each complemental with the corresponding gear on. the stud-shaft and independently revolvable on the feed-shaft, a rod provided with relatively short feather adaptedjtoengage any one of said gears in driving engagement with the feed-shaft, a

lever` for adjusting said feather, a dial having rows of alined apertures therein, a lever connected to' said lever engaging the rod and4 having a projection adjustable in said apertured dial to regulate the speed of the feedshaft, a pluralityof threade'dshafts rotated from the feed-shaft and parallel therewith, a die foreach engaging the carriage and means operated by thev dial for engaging anyof said screw-shaftswitn its die to move the carriage. 4 j

7. The combination with a lathe-bed, carriage, head-stock and arbor, of a revoluble feed-shaft'journaled at the side ofthe bed, a i stud-shaft on the end of the frame, a plurality i of rigidly-connected gears rotatable thereon and of ldifferent sizes, driving connections between the arbor and one o f said gears, a plurality of gears nlthe feed-shaft each complemental with the corresponding gearon the j stud-shaft and independently revoluble, a relatively short feather adapted to engage lvany one of saidgears in driving engagement,

a lever for adjusting said featl er, a dial indicating the adjustment, a plurality of threaded shafts each having a different lead, and driven from the feed-shaft, a die for engaging the carriage with each shaft and means operated by the movement of the indicating-dial to engage any one of the respective threaded shafts, with its die whereby the rate of the speed is determined by the gears engaged to the feed-shaft and the threaded shaft engaged to the die.

L 8. In a device of the class described the combination withascrew-shaft and its complemental die, a carriage,l a shaft journaled' on said carriage, a cross-slide carried on said carriage, a tool thereon, means on said shaft adapted to adjust the depth of-said tool, a

lever on the end of said shaft, a detent adapted to engage said shaft and hold the tool in cutting position, a stop engaged to the frame for-releasing said detent, means on said shaft fer releasing said tool from the :cut and operative connections between said shaft on the carriage and screw-shaftsand die adapted when the tool is retracted from the cut to release the die from the screw-shaft. i

9. in a device of the class described the combination with a screw-shaft of a die therefor, a carriage, a torsion-shaft journaled en said carriage, a crcss-slidecarried on said carriage, a screw-shaft engaging said-,crossL slide'adapted tc regulate the dsepth of cutting, a datent adapted to hold said telefon-shaft, means in the paths of its movement for releasing said datent, 'tension means acting tc partially rotate said torsion-shaft and o erative connections between said torsion-s aft and die adapted to release the die from the screw-shaft. Y c

10. In a machine ofthe class described the combination with a feed-shaft independently rotatable gears thereon, of a beveled gear ro-l tatably engaged on said shaft near one end and a spur-gear near the other, a plurality of threaded shafts each having a different lead of thread and journ aled in said gear and beveled gear around the shaft, a dial,gconnec tions betweenV said dial and, first-named gears, an adjustmg-shaft on said dial, a beveled gear thereon meshing with that on the feed-shaft, a pinion on the feed-shaft, a pinion projecting beyond the beveled gear on each of the threaded shafts and an intermediate pinion adapted to drive any of said shafts from the feed-shaft, a die-shaft arallel with the feed-shaft, a die-block feat ered thereon and having threaded seats comple- .mentalV with the threaded shaft.A

l1. In a device of the class described,` the combination with a lathe, carriage and feed `mechanism therefor and means whereby the feed mechanism may be disconnected from the carriage, of a shaft journal'ed longitudinally of the carriage, a detent holding said shaft normally from movement, an adjustable stop on the lathe positioned 'to release the detent at the end of the cut, a torsionspring adapted to partially rotate said shaft, a cross-slide, operative connections between the cross-slide and shaft adapted to retract the tool upon said rotation and o erative connections between said shaft and ongitudinal feed mechanism whereby the longitudi-- nal movement of the carriage is arrested simutaneously with the retraction of the feedtoo 12. In a machine of the class described, a knock-out or releasing mechanism, comprising in combination with the feed mechanism for the carriage, a lon itudinal shaft journaled on the carriage, a 'detent normally holding the same, a torsion-spring acting to movable cross-slide, a .thrca'dcd shaft actuating said cross-slide, an eccentric carried on said longitudinal shaft, and operatively connected vwith -the threaded shaft and astop arranged to release the detent at a predetermined point. i

13. In a lathe the combination with an automatically-operating feed mechanism, of a carriage movable thereby longitudinally of the lathe, a cross-slide adjustable transversely of said carriage, a shaft journaled on vsaid carriage, a torsion-spring thereon adapt- ',ed to partly rotate the same, an eccentric cn 'said shaft, means thereon connected with said cross-slide and'adapted to support said slide agaiA `.it lateral thrust, a longitudinallyslidable rod on said carriage adar" l ner- IBG - rotate the shaft when released, a transvcrscly- TTS . mally hold saisi. 'shaft from rotation7 a, lever thereomand means adapted to operate said lever at one limit of the movement of the carriage andl to release, said shaft to' retract the tool from the out.

MQ 'In a lathe the combination with a bed l "of @longitudinally-movable feed-Carriage thereon, a feedeerew4 a helffdie therefor, a swiigiug4 shaft carrying seid die; e ytorsionshaftohthe cerraffe having connections to the'tool-holder e115 adpted to retract the toollby partial rotation, a-erank-erm thereon,

,e @rank-arm et each eiil of the swinging Shaft, n longitudinal shaft provided With .eee-,831

crank-arms connected .with the mank-arme on the swinging shaft, a central crank-arm thereon end a rod connecting eeirl @rank-erm with the y-ereuk-e;'m on the tersomshztftwhereby rotation of the torsion-shaft een; also to diseolmeet the' die from the feedsllef't. f -y lr; testimony whereof-I have hereunto subscribed' my name in the presellme tv m sub zioing witnesses.A v' v JAMES C. LMl-'H.

Ni messes G. M. HILLS, W, E? WHHILNBURY, 

